Question about Canon EF 70-200mm f/2.8L USM Lens
This is done in your camera not with the lens. On most Canons there is a button with a picture of a box with focus points in it. You hold this down whilst turning your main dial (the one you use to change shutter speed) this will cycle through your focus points. On the 40D and most other cameras this button should be at the very right hand top corner of the back of your camera.
Posted on Sep 15, 2009
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Posted on Jan 02, 2017
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